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- Title
四川盆地威远—资阳地区筇竹寺组页岩气 富集规律及勘探开发潜力.
- Authors
梁 峰; 姜 巍; 戴 赟; 陈 禹; 罗 超; 张 琴; 佟恺林; 胡 曦; 卢 斌
- Abstract
Qiongzhusi Formation is one of the main shale gas exploration strata in China, which has great re⁃ source potential. At present, it has not yet realized large-scale commercial development, and its exploration and development prospects need to be further confirmed. Based on the data of 14 shale gas wells and conventional wells, this paper analyzes shale gas accumulation conditions, establishes the shale gas enrichment model, and points out the next exploration direction in Sichuan Basin. The main conclusions are as follows: (1) The strati⁃ graphic division criteria of Weiyuan-Ziyang and its surrounding areas are preliminarily defined. It is pointed out that four sets of favorable shale gas layers are mainly developed in this area, with a single layer thickness of 20- 50 m, and the thickness tends to increase from Weiyuan to Ziyang. (2) Combined with conventional drilling data, it is pointed out that shale gas content, porosity and reservoir pressure are increasing from Weiyuan to Ziyang. (3) The shale gas enrichment model in Weiyuan-Ziyang areas is established. It is clear that the reservoir in the rift trough(around Well GS17) is a favorable area for shale gas enrichment with large thickness, well-devel⁃ oped pores, high pressure and good floor conditions. It is pointed out that overpressure and pore development are the key factors for shale gas enrichment in Qiongzhusi Formation. (4) It is clear that the favorable areas (burial depth < 5 000 m) in the work area are mainly distributed in the rift trough of Weiyuan-Ziyang areas, and the resource amount is 3.5 trillion cubic meters. However, the high maturity, low porosity, large burial depth and unclear in-situ stress conditions of shale reservoir, bring uncertainty to the high-yield breakthrough and eco⁃ nomic development of Qiongzhusi Formation.
- Publication
Natural Gas Geoscience, 2022, Vol 33, Issue 5, p755
- ISSN
1672-1926
- Publication type
Article
- DOI
10.11764/j.issn.1672-1926.2021.10.016